Bevel-square.



No. 75,897.y Patented nee. is, |902.

' E. w.`sTm-:En. l A

BEVEL SQUARE. (Appximion med Jun. so. .19625 maman.)

f ii UNITED' SSTATES PATENT OFFICE.

ERIC W.' STREED, 0F MINNEAPOLIS, MINNESOTA.

Bevat-SQUARE.

SPECIFICATION forming part of Letters Patent No. 715,897, dated December16, 1902.

Application filed June 20,1902.

To wl whom, it Wawy concern:

Be it known that I, ERIC W. STREED, a citizen of the United States,residing at Minneapolis, in the county of Hennepin and State ofMinnesota, have invented certain new and useful Improvements inBevel-Squares; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesaine.

My invention has for its object to provide a bevel-square of improvedconstruction g and to this end it consists of the novel devices andcombinations of devices hereinafter described, and dened in the claim.

The invention is illustrated in the accompanying drawings, wherein likecharacters indicate like parts throughout the several.

views. A

Figure l is a plan view, with some parts broken away, showing myimproved bevelsquare. Fig. 2 is a side elevation of the same, some partsbeing broken away. Fig. 3 is a section on the line m3 :r3 of Fig. l, andFig. 4 is a section on the line x4 x4 of Fig. 3. l

The character a indicates the head of the square,and the character hindicates the blade thereof. The head ais bifurcated or slit, as shownat ct', to afford a seat for the blade b. One prong of the bifurcatedportion of the head a is made shorter than the other and is extended bya case-section or housing c, the ange c' of which is rigidly secured tothe short prong of said head by screws or other suitable devices.

Working within the casing cis a relatively large gearf and intermeshingpinion j", the former of which is rigidly secured to the pivoted end ofthe blade l) by screws f2 or other suitable'devices. A pivot is affordedfor the gear f and blade h byaclamping-boltg,which works loosely throughthe hub of said gear and is screwed into the hub 7c of athin plate lc',which is secured by screws or other devices to the long prong of thebifurcated end of the head d, as best shown in'Fig. 3. The clamping-boltg is preferably provided at its outer end with the shoulderedthumb-piece g', which bears against the outer face of the case c. Vhenthe clamping-bolt g is tightened, it springs the prongs of the head dtoward each other and tightly clamps the pivoted end of the blade bagainst the long prong of the head o. and tightly pinches the hub of thegearf between the wall of the case c and the nut or hub la, thussecurely holding said gear and blade in whatever position they may beset.

The character fm indicates a thin metal plate which is secured to thecase c or at least held against rotation with respect thereto and servesto exclude dust from the interior of said case. This dust-guard or platem completely covers the pinion f', but works loosely in an annular`groove or notch cut in the gear f.

The pinion f is rigidly secured to a short shaft f3, which extendsthrough and is journaled in the wall of the case c, as best shown inFig.'3. At its outer end the shaft f3 is provided with a dialp, whichpreferably works in a shallow closely-fitting seat formed in the outerface of the case c. This dial is graduated to indicate degrees, but not,however, actual degrees of angular movement of said dial. To illustrate,the gear fis four times the diameter of the pinion f', and consequentlyif the said gearfand the blade l) be moved through an arc of ninetydegrees the pinion f and dial p will be given four times as much rotarymovement-that is, will be given a complete rotation. Now, as ninetydegrees is the greatest movement of the blade b which it is necessary toindicate, the dial p is graduated in multiples or fractions of ninetydegrees. In this wayauyslight movement of the blade b and gearfwill bemultiplied four times on the dial p, and thus, as is evident, a muchgreater accuracy is obtained than would be obtained by placing the dialon the gearfl or where it would receive direct movement from the bladeof the square. For cooperation with the dial p a pointer of somesuitablecharacterisprovided. Suchapointer may be afforded by a simpleradial mark 1o', placed on the outer face of the case c adjacent to saiddial, as shown in Fig. l. Of course it is not necessary that therelation of four to one be maintained between the gears fand f', but itis important in all cases that the rotary movement of the dial p bematerially great r than that of the blade b. It

will also be understood that the so called dial might be marked on arelatively Xed ICO part and the so-called pointer be made to move overthe same. This Would be simply a reversalof the construction shown andclearly Within the scope of my invention. In this construction it is ofcourse very important that the coperating gears or gear and pinionsquarefor use in laying out stairs.

What I claim, and desire to secure by Letters Patent of the UnitedStates, is as follows:

The combination with the head a, bifurcated at a', of the case c securedto one prong,r

of said head a, the plate 7c secured to the other pron g of said head aand provided with the hub k, the clampingbolt g working through the Wallof said case c and screwed into said hub la, the large gearflooselymounted on said clamping-bolt, the blade b secured for angular movementswith said gear f, the pinion f mounted Within said case and meshing withsaid gear, the graduated dial p meshing with said pinion f', and apointer p on the exterior of said ease c, said parts operatingsubstantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

ERIC W. STREED.

Witnesses:

ELIZABETH H. KELIHER, F. D. MERCHANT.

